Cholinergic synapses

Synapses that use acetylcholine are called cholinergic synapses.

1. Arrival of an action potential - 

• An action potential arrives at the synaptic knob of the presynaptic neurone
• The action potential stimulates voltage-gated calcium ion channels in the presynaptic neurone to open.
• Calcium ions diffuse into the synaptic knob (they're pumped out afterwards by active transport)

2. Fusion of the vesicles - 

• The influx of calcium ions into the synaptic knob causes the synaptic…